I'm sure China will send a strongly worded letter.

No, I don't think so... China will only watch until the U.S personally stirs their shit up...

Iirc there were Russian and Cuban soldiers in Venezuela during the attempted coup against Maduro by Guaido and the Bay of Piglets. No idea if China would support Venezuela, but China said this: Wang Wenbin, Chinese spokesperson, says he "supports Venezuela and Guyana" in the Essequibo dispute because "both are good friends."

Anyway, these two countries are fifteen thousand kilometers away from us.So we are irrelevant.